The eddy current proximity probe detects changes (losses) in the magnetic flux density field generated by the presence of a material target. These changes in the field, which are detected by the probe, are proportional to the distance to the target and dependent on both the magnetic properties and bulk conductivity of the material.
In addition to our wide range of available probes, we also provide custom engineered probes for specific applications.
The probe used in conjunction with a probe driver or transmitter is able to effectively and accurately measure changes in the distance down to thousands of an inch (.001) or mils.
In position applications, the probe is used to measure the thermal growth of casings, rotors, and thrust bearing wear. In vibration applications, the probe is used to measure the changes in the distance to a rotating shaft (changes in the distance relates to vibration on that shaft) and the probe is calibrated to a 10kHz frequency response to create a replica of the vibration waveform.
Eddy current probes are immune to various contaminated elements such as oil and dirt and have their performance has proven to be reliable in such environments, which makes them the ideal choice to use in machinery applications.
Loop-Powered Transmitters convert the output from proximity probes, seismic sensors, into a 4-20mA DC current, which is proportional to the input being measured. The transmitter converts the displacement or vibration signal to DC voltage and/or current for a DCS or PLC system. They control a 4-20mA current loop for a specified vibration range (ex. 0-5 mils peak-to-peak). The transmitters have a two-wire hook-up, powered solely by the loop current and have a power supply range of 15 to 36 volts.
